Update README.md to include GZ_RSYNCABLE

Author: teun95

README.md

@@ -166,6 +166,7 @@ Your Organization will be mapped to `DB_USER` and your root token will need to b
 | `COMPRESSION_LEVEL`            | Numberical value of what level of compression to use, most allow `1` to `9` except for `ZSTD` which allows for `1` to `19` - | `3`            |
 | `ENABLE_PARALLEL_COMPRESSION`  | Use multiple cores when compressing backups `TRUE` or `FALSE`                                                                | `TRUE`         |
 | `PARALLEL_COMPRESSION_THREADS` | Maximum amount of threads to use when compressing - Integer value e.g. `8`                                                   | `autodetected` |
+| `GZ_RSYNCABLE` | Use --rsyncable (gzip only) for faster rsync transfers and incremental backup deduplication. e.g. `TRUE`                                                   | `FALSE` |
 | `ENABLE_CHECKSUM`              | Generate either a MD5 or SHA1 in Directory, `TRUE` or `FALSE`                                                                | `TRUE`         |
 | `CHECKSUM`                     | Either `MD5` or `SHA1`                                                                                                       | `MD5`          |
 | `EXTRA_OPTS`                   | If you need to pass extra arguments to the backup command, add them here e.g. `--extra-command`                              |                |